Process for fibrillating lignocellulosic material, fibres and their use

Inactive Publication Date: 2013-03-07
UNIVERSITY OF HELSINKI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]One advantage of the invention is that ionic liquids affords a media which do not contribute to environmentally polluting volatile organic compound (VOC) emissions. This is in part due to the extremely low volatility of most ionic liquid media. The ionic liquid technology research is a rapidly expanding area of materials science. Ionic liquids seem to offer potential sustainable technology platforms for some environmentally benign new and alternative processes.
[0018]A further advantage of the invention is that the basically intact fibres are closer to their native structure and molecular weight, than those obtained from traditional pulping, fractionation or extraction processes. During the ionic liquid treatment, the treated fibres maintain their advantageous fibrous properties and yet retain a practically similar mass compared to the mass of the starting lignocellulosic material.
[0019]Several advantages are further achieved when the present invention is used for pre-treatment of wood, for example before chemical pulping, such as Kraft pulping. The ionic liquid treatment allows for milder cooking, for example influences the cooking temperature and time and therefore reduces the energy consumption. The process according to the invention also increases the surface area of the lignocellulosic material for the delignification process. Further mild delignification under aqueous basic conditions is achieved, even in the absence of sulphur, yielding a sulphur-free lignin. This is an advantage compared to traditional pulping due to reduced catalyst poisoning during cracking, lower sulphur emissions during combustion or easier reagent reco

Problems solved by technology

The quality of these fibres, as pulp, is generally low, due to their high lignin content.
This degradation may allow for more efficient fractionation, h

Method used

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  • Process for fibrillating lignocellulosic material, fibres and their use
  • Process for fibrillating lignocellulosic material, fibres and their use
  • Process for fibrillating lignocellulosic material, fibres and their use

Examples

Experimental program
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Effect test

example 1

Preparation of 1-methyl-3-methylimidazolium dimethylphosphate ([mmim]Me2PO4)

[0070]A mixture of 1-methylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to trimethylphosphate (60.7 ml, 0.519 mol) at 100° C., with stirring. The solution was heated at 100° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (110 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

example 2

Preparation of 1-ethyl-3-methylimidazolium dimethylphosphate ([emim]Me2PO4)

[0071]A mixture of 1-ethylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to trimethylphosphate (60.7 ml, 0.519 mol) at 120° C. with stirring. The solution was heated at 120° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (110 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

example 3

Preparation of 1-ethyl-3-methylimidazolium methylhydrogenphosphonate ([emim]MeHPO3)

[0072]A mixture of 1-ethylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to diethylphosphite (47.6 ml, 0.519 mol) at 140° C. with stirring. The solution was heated at 140° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (97 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

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Abstract

The invention relates to a process for fibrillating lignocellulosic material wherein the process comprises treating lignocellulosic material with ionic liquid and recovering basically intact fibres of said lignocellulosic material. Another object of the invention is to provide an activated and/or basically intact fibre wherein the lignocellulosic material is treated with ionic liquid and a basically intact fibre of said lignocellulosic material is recovered. The invention further relates to the use of the basically intact fibre of the invention in the production of bio-based materials, preferably bio-plastics, more preferably conductive polymers, stimuli-responsive polymers, bio-based polymer composites, ceramics, fabrics, or elastomers. A process for producing paper, board, pulp or the like from fibers of lignocellulosic material which have been treated with ionic liquid and recovered as basically intact fibres is also enclosed.

Description

FIELD OF THE INVENTION[0001]The invention relates to a process for fibrillating lignocellulosic material wherein the process comprises treating lignocellulosic material with ionic liquid and recovering basically intact fibres of said lignocellulosic material. Typically the process comprises increasing the surface area of said lignocellulosic material. Another object of the invention is to provide an activated and / or basically intact fibre wherein the lignocellulosic material is treated with ionic liquid and a basically intact fibre of said lignocellulosic material is recovered.[0002]The invention further relates to the use of the basically intact fibre of the invention in the production of bio-based materials, preferably bio-plastics, more preferably conductive polymers, stimuli-responsive polymers, bio-based polymer composites, ceramics, fabrics, or elastomers. A process for producing paper, board, pulp or the like from fibers of lignocellulosic material which have been treated wit...

Claims

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Application Information

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IPC IPC(8): D21B1/04D21F11/00D21C9/00
CPCD21H11/18D21C9/007D21B1/02
Inventor KILPELAINEN, ILKKAKING, ALISTAIRKARHUNEN, PIRKKOMATIKAINEN, JORMA
Owner UNIVERSITY OF HELSINKI
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